Chosen Solution

I was replacing the battery, following the ifixit guide… I was Upto step 9 and but I knocked off 1 of 2 silver metal circles just above battery connector in the middle. what do these 2 metal circles do? should I super glue it back on? or does this metal component need more attention (like a soldering iron)? what do I need to do? Update (05/25/2020)

Thank you for your replies. so based on the image and information provided… can I glue this back to the board? or does this need soldering?

It looks like basically a nut that you can put a screw into it. Update (05/25/2020) It will need to be soldered down to secure it.

You will need to get some acetone to clean off the surfaces and then carefully screw in the screw back into the plate and the stud so the plate sits correctly. then carefully screw in the other screw which holds the plate to the second stud. Now ever so carefully lift the edge of the plate just enough (hairline) so you can drip a drop of Cyanoacrylate glue (a.k.a Krazy Glue) There is no solder used here.